1.

1. The king of the oilfield is the driller. P. During the process of drilling, gas and oil may be met. Q. He is a very skilled man. R. If this rushes out and catches fire it is dangerous. S. Sometimes he sends his drill more than a mile. 6. This danger is well-known and steps are taken to prevent it.

A. PQRS
B. QSPR
C. QPRS
D. QSRP
Answer» C. QPRS


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